Honestly, I don't remember much about any collectibles. I beat it shortly after it came out. I remember the story, a lot of climbing, and the action sequences since they standout since they're so few and far between.
Tomb Raider is a good example. Well at least the originals. I never cared for them because of
and not enough action. I'm not big on heavy exploration and puzzle solving. But that's just me. I assume you're talking about the newer ones. I only played and beat the reboot, but I think I that, too, had better pacing than this.
I think I can replay UC2 and even 3 more often because of the good combination of exploration, collectibles, and combat. I'm more of an action-oriented person, myself, but it really all depends on what you want out of a game. I'm not a multiplayer person so I always appreciate any SP experience that offers plenty of replay value.